Novus TxRail-USB User manual

NOVUS AUTOMATION 1/4

Rail-USB

TEMPERATURE TRANSMITTER

- OPERATING MANUAL – V2.0x B

INTRODUCTION

TxRail-USB is an USB configurable DIN rail mount temperature

transmitter. It allows selection and configuration of input type,

measurement range, output type and calibration. Its output can be

set to either loop powered 4-20 mA or 0-10 Vdc. Highly accurate and

user-friendly, the TxRail-USB performs well from simple to

sophisticated measurement applications.

The output current or voltage is linearized according to the selected

input sensor and adjusted to the configured range.

SPECIFICATIONS

Sensor input: User defined. The supported sensors are listed in

Table 1, along with their maximum ranges.

Thermocouples: Types J, K, R, S, T, N, E and B, according to

IEC 60584 (ITS-90). Impedance >> 1 MΩ

Pt100: Excitation 0.8 mA, α= 0.00385, according IEC 60751

(ITS-90).

For 2-wire sensors, tie terminals 3 and 4 together.

Pt1000: Type 3-wire, Excitation 0.8 mA, α= 0.00385, according

IEC 60751 (ITS-90).

For 2-wire sensors, tie terminals 3 and 4 together.

NTC R25°C: 10 kΩ ±1 %, B25/85 = 3435

Voltage: 0 to 50 mVdc. Impedance >> 1 MΩ

0 to 100 mVdc. Impedance >> 1 MΩ (*)

(*) Feature available for devices with firmware version

starting at V2.0x.

Sensor Type

Maximum Measurement

Range

Minimum Measurement

Range

Voltage

0 to 50 mV

5 mV

Voltage 0 to 100 mV 10mV

Thermocouple K -150 to 1370 °C 100 °C

Thermocouple J -100 to 760 °C 100 °C

Thermocouple R -50 to 1760 °C 400 °C

Thermocouple

-50 to 1760 °C

400 °C

Thermocouple

-160 to 400 °C

100 °C

Thermocouple N -270 to 1300 °C 100 °C

Thermocouple E -90 to 720 °C 100 °C

Thermocouple B 500 to 1820 °C 400 °C

Pt100 -200 to 650 °C 40 °C

Pt1000

-200 to 650 °C

40 °C

NTC

-30 to 120 °C

40 °C

Table 1 – Sensors accepted by the transmitter

Switch-on delay: < 2.5 s. The accuracy is only guaranteed after 15

minutes.

Terms of reference: ambient: 25 ° C; voltage: 24 Vdc, load: 250 Ω;

settling time: 10 minutes

Temperature Effect: < ±0.16 % / 25 °C

Response time: typical 1.6 s.

Maximum voltage allowed at input terminals no sensor: 3 V.

RTD current: 800 µA.

RTD cable resistance effect: 0.005 °C / Ω

Maximum allowable cable resistance for RTD: 25 Ω.

Sensor Type Typical

Accuracy

Maximum

Accuracy

Pt100 / Pt1000

(-150 to 400 °C)

0.10 % 0.12 %

Pt100 / Pt1000

(-200 to 650 °C)

0.13 % 0.19 %

K, J, T, E, N, R, S, B

0.1 % (*)

0.15 % (*)

mV 0.1 % 0.15 %

NTC 0.3 °C 0.7 °C

Table 2 – Calibration error, percentage of the full measurement range.

(*) Add cold junction compensation: < ± 1 °C.

Power supply influence: 0.006 % / V typical (percentage of the full

measure range).

Output (4-20 mA): 4-20 mA or 20-4 mA current, 2-wired; and

proportional to the configured range.

Output Resolution (4-20 mA): 2 µA.

Output (0-10 Vdc): 0-10 Vdc or 10-0 Vdc voltage, and proportional

to the configured range.

Output Resolution (0-10 Vdc): 0.0025 V (12 bits)

Power supply: 10 to 35 Vdc (output 4-20 mA) and

12 to 35 Vdc (output 0-10 Vdc).

Maximum load (RL): RL (máx.) = (Vdc – 10) / 0.02 [Ω]

Where: Vdc= Power supply voltage (10-35 Vdc)

Operating Temperature: -40 to 85 °C

Humidity: 0 to 90 % RH

Electromagnetic Compatibility: EN 61326-1:2006

No electrical isolation between input and output.

Internal protection against polarity inversion.

Cold junction compensation for thermocouples.

Connection Wire Cross Section: 0.14 a 1.5 mm²

Screw Tightening: 0.8 Nm.

Housing: ABS UL94-HB.

Certification: CE, UKCA

CONFIGURATION

Changes to the configuration are possible through the TxConfig II

software, provided free of charge.

The transmitter configuration interface (USB cable) can be

purchased from the manufacturer or its authorized sales

representatives.

TxRail-USB

NOVUS AUTOMATION 2/4

The TxConfig II software is continuously updated and new versions

can be downloaded at no charge from the manufacturer’s website.

To install, execute the TxConfigIISetup.exe file and follow the

instructions.

Fig. 1 – USB cable connection

During the setup, the transmitter is powered by the USB, not

requiring an external power supply.

The transmitter setup can also be made by connecting it to the loop,

using the loop power supply. There is no electrical insulation between

the transmitter and the communication port (interface), therefore it is

not recommended to configure it with the sensor inlet connected to the

process. See Fig. 2.

Fig. 2 – USB cable connections – Loop powered

After these connections, the user must run the TxConfig II software

and, if necessary, consult the Help topic to help using the software.

The USB communication port (interface) of the

TxBlock-USB is not electrically insulated from the

transmitter’s input.

SOFTWARE CONFIGURATION:

Fig. 3 – TxConfig II software main screen

The fields in the screen mean:

1. General Information: This field shows information that identifying

the transmitter. This information should be sent to the

manufacturer in an eventual request for technical assistance.

2. Sensor: Select the type of sensor to be used. See Table 1.

3. Measuring Range: Sets de measurement range of the

transmitter.

Lower Range Limit: Desired temperature for minimum

retransmission value.

Upper Range Limit: Desired temperature for maximum

retransmission value.

Sensor Range

The values chosen cannot exceed the range of sensor shown in

this field. See Table 1 of this manual.

Minimum Range

Do not set a lower band (span) that the Minimum Range

indicated below in this same field. See Table 1 of this manual.

4. Sensor Failure: It establishes the output behavior, when the

transmitter indicates a failure:

Minimum: output current goes to < 3.8 mA or output voltage is 0

V (down-scale), typically used for refrigeration.

Maximum: output current goes to > 20.5 mA or output voltage is

10 V (up-scale), typically used for heating.

5. Zero Correction: It corrects small deviations presented in the

transmitter output, for example, when the sensor is replaced.

6. Send Configuration: It applies the new setup. Once sent, the

setup will be immediately adopted by the transmitter.

7. Read Configuration: Reads the current setup in the transmitter

connected. The screen now presents the current setup that may

be changed by the user.

FACTORY SETTING:

• Sensor: Pt100 3-wire, range 0 to 100 °C

• Sensor failure: upscale (maximum).

• 0 °C zero correction.

• Unit: °C;

• Output: 4-20 mA.

MECHANICAL INSTALLATION

The TxRail-USB transmitter is suitable to be installed in 35 mm DIN

rail. Vibrations, moisture and extreme temperatures, electro-magnetic

interference, high voltage and other interferences can permanently

damage the unit, and could cause error in the measured value.

DIMENSIONS:

Fig. 4 – Transmitter dimensions

TxRail-USB

NOVUS AUTOMATION 3/4

OPENING THE TRANSMITTER:

In order to open the transmitter, you must press the orange lockers

located on both sides of the enclosure and pull the frontal cover very

carefully, just like shown in Fig. 5.

Fig. 5 – Opening the transmitter

ELECTRICAL INSTALLATION

The Fig. 6 shows the electrical connections required. The TxRail-

USB wiring for thermocouple, RTD, resistance and voltage are

done according figure below.

Fig. 6 – TxRail-USB transmitter electrical connections

LOAD represents the 4-20 mA current or the 0-10 V voltage

measuring device (indicator, controller, register, etc.).

• Polyamide enclosure.

• Section of the cable used: 0.14 to 1.5 mm ²

• Recommended torque in the terminal: 0.8 Nm.

RECOMMENDATIONS FOR INSTALLATION

• Conductors of small electrical signals must be distant from

activation and high-tension/current conductors, preferably passing

through grounded conduits.

• A specific electrical power supply network should be provided for

instruments use only.

• In controlling and monitoring applications, possible consequences

of any system failure must be considered in advance.

• RC filters (47R an 100nF, serial) in inductor charges (contactors,

solenoids, etc.) are recommended.

ELECTRICAL CONNECTIONS

The figures below show the electrical connections required. The

terminals 1, 2, 3 and 4 are dedicated to the sensor connection.

LOAD represents the 4-20 mA current or 0-10 V voltage measuring

device (indicator, controller, recorder, etc.).

PT100/PT1000 2-WIRE / NTC

Note: When the Pt100/Pt1000 2-wire the terminals 1 and 3 must be

interconnected, according to the figure below.

To use the Pt100/Pt1000 2-wire, you must configure the

Pt100/Pt1000 3-wire option in TxConfig II.

The Pt100/Pt1000 wire length should be less than 30 cm to

maintain the measurement error within specifications (electrical

resistance).

Fig. 7 – Transmitter electrical connections (Pt100/Pt1000 2-wire / NTC)

PT100/PT1000 3-WIRE

Fig. 8 – Transmitter electrical connections (Pt100/Pt1000 3-wire)

PT100 4-WIRE

Fig. 9 – Transmitter electrical connections (Pt100 4-wire)

Pt100 3 and 4-wire: For appropriate cable resistance compensation

they should be equal for all legs. Maximum wire resistance is 25 Ω per

wire leg. Usage of a 3 or 4 wire with conductors of equal length and

gauge is recommended.

THERMOCOUPLES

Fig. 10 – Transmitter electrical connections (Thermocouple)

TxRail-USB

NOVUS AUTOMATION 4/4

VOLTAGE (0-50 mV / 0-100 mV)

Fig. 11 – Transmitter electrical connections (0-50 mV / 0-100 mV)

OUTPUTS (0-10 V and 4-20 mA)

Fig. 12 – Transmitter electrical connections (0-10 V and 4-20 mA)

OPERATION

The sensor offset can be changed through the TxConfig II software.

The USB cable may be connected to the transmitter without causing

any measurement errors. See item Zero Correction in the chapter

CONFIGURATION of this manual.

The user must choose the most suitable sensor and range to the

process. The chosen range must not exceed the maximum range of

measurement defined for the sensor and should not be smaller than

the minimum range for the same sensor.

It is important to note that the transmitter accuracy is based on the

maximum range of the sensor used, even when a narrower range is

programmed. Example:

• The Pt100 sensor in the range 0 to 100 °C and accuracy of

0.12 %, the maximum error will be 1.02 °C (0.12 % de 850 °C);

• The Pt100 sensor in the range 500 to 600 °C and accuracy of 0.19

%, the maximum error will be 1.61 °C (0.19 % of the 850 °C).

Note: When measurements are made at the transmitter, see if the

Pt100 excitation current required by the calibrator is compatible with

the Pt100 excitation current used in the transmitter: 0.8 mA.

WARRANTY

Warranty conditions are available on our website

Novus TxRail-USB User manual

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